Hello, I am trying to execute power top on my Virtual Machine with specification OS 6.5 Scientific Linux and I get the following message : pread cpu0 0xe8 : input/output error. The powertop version i am using is 2.3. I have tried running older versions like 1.11 which was running properly but as I red 1.11 measures cpu wake ups and not energy consumption as the 2.3. Any idea what the problem may be and how can I solve it ? Best Regards, Stefanos Georgiou BSc in Network and System Programming Computer Science Department University of Cyprus MSc in Pervasive Computing and Communications for Sustainable Development (PERCCOM) Joint Master Degree University of Lorraine, Lappeenranta, Lulea, ITMO Saint-Petersburg _______________________________________________ PowerTop mailing list PowerTop(a)lists.01.org https://lists.01.org/mailman/listinfo/powertop